JPS592362Y2 - Gas tank with excessive flow rate prevention device - Google Patents

Description

[Detailed description of the invention] The present invention is equipped with a safety valve device that can quickly and automatically shut off the gas flow path in the event of an excessive gas outflow due to an unforeseen accident such as a gas rubber pipe coming off. ,
The safety valve device is configured so that the pressure on its upstream and downstream sides becomes equal and returns to the non-blocking state of the flow path only when the gas flow path opening/closing closure provided in the device is closed. In addition, a gas cock with an excessive flow rate prevention device that can exhibit an extremely excellent safety function, specifically, a closure that can be opened and closed in the middle of the gas flow path, and the gas flow is A safety valve device that automatically closes the passage is provided, and a gas bypass passage is provided on the upstream side and the downstream side of the safety valve device, and the gas bypass passage is brought into a non-blocking state only when the closing member is moved to close. The upstream side and the downstream side of the safety valve device, which were automatically closed due to passage of excessive gas flow, are brought into communication by the closing movement of the closure to equalize the pressure, thereby automatically closing the safety valve device. The present invention relates to a gas cock with an excessive flow rate prevention device that is configured to be released in a gas leakage prevention state.

As a conventional gas cock of this kind, for example,
There is one disclosed in Japanese Patent No. 34501, but its structure has a special and complicated structure that is significantly different from that of a normal gas cock that does not include a safety valve device.

In other words, as a means for installing a safety valve device on the upstream side of the force-based flow path closer, the gas flow path is detoured to the side of the cock body, and an opening/closing lid necessary for installing the safety valve device is installed in this detour portion. The structure of this gas cock is completely different from that of a normal gas cock, in which the cock body is integrally formed, and therefore the manufacturing process must also be special. This was extremely disadvantageous in terms of manufacturing costs.

This invention was made in view of the above circumstances.
The purpose of this is to provide an overflow prevention device with an overflow prevention device, and, like a normal gas cock without a safety valve device, the cock body is constructed in one piece, such as a monolithic casting. However, we have improved it so that it can easily incorporate a safety valve device inside it, so that it can be manufactured at low cost without requiring major changes to the manufacturing process. There it is.

In order to achieve L distribution, the gas cock with an excessive flow rate prevention device according to the present invention has a cock body that is substantially parallel to and above the upstream flow path portion constituting the gas flow path. The inner space has a downstream flow path portion located therein, and an intermediate space communicating with both flow path portions, and has a circular hole for inserting the closing member into the wall portion of the intermediate space. The gas bypass passage extending from the four first-stream side passages to the upper part of the intermediate space is integrally formed in the side wall of the intermediate space, and the safety valve device is connected to the side wall of the circular hole. The ball valve device is configured as a ball type valve device having an outer diameter smaller than the diameter of the ball valve, and is inserted through the circular hole and fixed to the lower part of the intermediate space, and the closure is inserted into the upper part of the intermediate space. The safety valve device is attached so that it can be rotated to open and close while closing the circular hole, and only when this closure is rotated to a position that closes the force flow path, the upstream side and the downstream side of the safety valve device are closed. , and are configured to be communicated by a bypass path.

That is, an intermediate space that communicates with the upstream flow path portion and the downstream flow path portion is provided in the gas cock body integrally formed by casting means, etc., and a closing member insertion circle is provided in the lower portion of this intermediate space. Since the safety valve device configured to have an outer diameter smaller than the hole diameter is inserted and fixed through the circular hole, there is no need to form a bypass flow path or install an opening/closing lid that was necessary in conventional devices. Therefore, the safety valve device can be installed easily and reliably using an economically advantageous manufacturing method that requires only a slight change in the shape of the general gas cock body and integral molding by casting etc. It has come to be.

Moreover, according to the above structure, since the safety valve device is provided inside the cock body, the appearance of the cock body can be made into a clean shape, and the opening/closing lid can be loosened, which is common in conventional ones. There is also the advantage that there is no need to worry about the occurrence of a defective situation such as a corresponding deterioration of the original safety function.

Hereinafter, embodiments of the present invention will be described based on the drawings.

Reference numeral 1 denotes a gas cock that rotates a closing member 1b by means of a push-and-turn knob 1a, and a hose end 2 for connecting a power stem pipe is screwed onto the cock body IC. The pose end 2 is constructed so that it can be replaced with one having a different diameter depending on the inner diameter.

The cock body IC is manufactured integrally by casting, and includes an upstream flow path portion A' and a downstream portion located above and approximately parallel to the flow path A'. A vertical intermediate space A is formed which communicates with the flow passage portion A'' and both flow passage portions A' and A'', and an earthen wall of the cock body 1 corresponding to the upper part of this intermediate space A'' is formed. A circular hole C necessary for inserting the closure 1b into the cock body 1 is bored in the section, and furthermore, within the wall thickness of the upstream vertical side wall of the intermediate space A'', A gas bypass passage 1d is formed extending from the upstream passage portion A' to the intermediate space A#/-.

The lower part of the intermediate space A/// has a hole safety valve device B having a size that allows the whole to pass through the circular hole C, that is, an outer diameter that is somewhat smaller than the diameter of the circular hole C. However, before the closure 1b is attached, it is inserted through the circular hole C and fixed by screwing.

After the safety valve device B is inserted and mounted, the closure member 1b is attached to the upper portion of the intermediate pace A″′ so as to be able to rotate to open and close while closing the circle 7LC.

This closure 1b has an internal space a with an open bottom and one side, and when the closure 1b is rotated to an open position where the one side open part faces the downstream flow path section A///. When the gas bypass passage 1d is blocked by the other peripheral wall of the closure 1b and the closure 1b is rotated to a closed position where the other peripheral wall faces the downstream flow path portion A'', the gas bypass passage 1d is closed. The internal space a of the child 1b and the upstream passage portion A' are communicated via a gas bypass passage 1d.

The structure of the ball valve hole safety device B will be described in detail below.

3 is a cylindrical valve box with a ball valve 3b housed in its internal space, and its upper wall serves as a valve seat 3a for the ball valve 3b, with a diameter slightly smaller than that of the ball valve 3b. A valve hole is provided facing the internal space a of the closure 1b, and a valve hole is provided in the center of the peripheral wall and bottom wall of the valve hole to communicate the internal space of the valve box 1 with the upstream flow path portion A'. Apertures 3C... are provided for the purpose.

The diameters of these openings 3c are made slightly smaller than the diameter of the ball valve 3b to prevent the ball valve 3b from deviating from the valve box 3.

In a normal flow state, the ball valve 3b falls to the bottom of the valve box 3 and closes the opening 3C in the center of the bottom wall, and in this state, the ball valve 3b and the cleared opening 3C. ... is such that the ball valve 3b is located below the horizontal central axis of the opening 3C.

That is, in the normal gas flow state in the state shown in FIG. The force applied to the ball valve 3b is only a force based on the negative pressure generated above the ball valve 3b due to the gas flow, and is relatively weak, and does not cause the ball valve 3b to float.

However, if the gas rubber pipe comes off from the hose end 2, an excessive amount of gas flows that exceeds the normal amount of gas used, and the negative pressure above the ball valve 3b becomes extremely large, causing the ball valve 3b to close. begins to surface.

When the ball valve 3b rises from the bottom of the valve box 3 even slightly, the opening 3C in the center of the bottom wall is also opened and gas flows upward from there as well, so the ball valve 3b is moved by the negative pressure at the top. Since it is not only pulled up but also pressed upward from below, it very quickly rises to the lower surface of the valve seat 3a and comes into close contact with it.

In this way, the gas flow path A is automatically closed instantaneously after the excessive flow of gas occurs, and the amount of gas leakage can be suppressed to a minimum.

After that, connect the gas rubber pipe to the hose end and tighten the knob 1.
When the shutter 1b is closed by operating the valve 1b, the gas bypass passage 1d is opened and the space a, l) above and below the valve seat 3a is opened.
becomes equalized, the ball valve 3b falls to the bottom of the valve box 3 under its own weight, and the ball valve hole safety valve device B automatically returns to its original state.

[Brief explanation of drawings]

The drawings illustrate embodiments of the gas cock with an excessive flow prevention device according to the present invention, and numeral 490 is a longitudinal sectional view showing different states. 1b...Closet, IC...Cock body, 1
d...Gas bypass path, A...Gas flow path, A'...Upstream flow path portion, A//...
...Downstream flow path section, A'''...middle space, B...safety valve device, C...circular hole.

Claims (1)

[Scope of utility model registration request] A closure 1b that can be freely opened and closed is interposed in the middle of the gas flow path A, and a safety valve device B that automatically closes the gas flow path A when an excessive flow rate of gas passes is provided, and the safety valve device B The above-mentioned closure 1b
A gas bypass passage 1d is provided which is brought into a non-blocking state only when the closure member 1b is closed. This gas cock is equipped with an excessive flow rate prevention device, and is configured to automatically release the closed state of the safety valve device B in a gas leak-preventing state by communicating with the valve body 1C to equalize the pressure. an upstream flow path portion A′ that constitutes the gas flow path A, and a downstream flow path portion A′ that is substantially parallel to and located above the upstream flow path portion A′;
an intermediate space A that communicates with both flow path portions A' and A'';
/'' inside, and a circular hole C for inserting the closure 1b into the earthen wall of the intermediate space A'', and further inside the side wall of the intermediate space A''. The safety valve device B is integrally formed to have the gas bypass passage 1d extending from the upstream flow passage portion A' to the upper part of the intermediate space A'', and the safety valve device B is formed with an outer diameter smaller than the diameter of the circular hole C. The valve device is configured as a ball type valve device having a diameter, and is inserted through the circular hole C to form the intermediate space A.
///, and the closure 1b is attached to the upper part of the intermediate space A'' so that it can be rotated to open and close while closing the circular hole C, and the closure 1b is fixed to the lower part of the gas flow. A gas cock with an excessive flow rate prevention device, characterized in that the upstream side and the downstream side of the safety valve device B are communicated through the gas bypass path 1d only when the path A is rotated to a closed position. .